JPH09272183A - Anti-newton ring film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make reflection of light less, to make light transmittance high, to make Newton ring hand to occur and dust and the line hard adsorb, when it is assembled as a display by laminating a transparent electrode layer on a transparent plastic film the surface of which is treated with an uneven treatment. SOLUTION: An anti-Newton ring film is prepd. by laminating a transparent electrode layer on a transparent plastic film the surface of which is treated with an uneven treatment. In addition, the uneven treatment is treated in such a way that at least 20 peaks per cm with a height of at least 0.1μm exist. when the peak height is lower than 0.1μm, the Newton ring is easily generated in the same way as the case with no uneven treatment and it is not pref. In addition, the haze value of this film must be at most 10%. When it exceeds this value, as the ratio of light scattered and transmitted is increased, an image with bad resolution is obtd.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an anti-Newton ring film. More specifically, the present invention provides
CRT (CRT), PDP (plasma display panel), LCD (liquid crystal display) and other electromagnetic wave shield electrodes and touch panel electrodes, etc. with anti-reflection properties, anti-glare properties, anti-Newton ring properties, high transparency and dust resistance. The present invention also relates to an anti-Newton ring film having both properties.

[0002]

2. Description of the Related Art In recent years, regulations concerning the generation of electromagnetic wave shields have been tightened. Usually, electromagnetic wave shielding is performed by covering a source of electromagnetic waves with a metal typified by lead. However, since these metals are not transparent, C
It cannot be used for display devices such as RT, PDP and LCD. Therefore, a transparent conductive film typified by ITO is used as an electromagnetic wave shield layer. As the base material of the electromagnetic wave shield layer, a transparent plastic film is preferable in terms of productivity and profitability. However, since the transparent plastic film alone is insufficient in strength, it is used by being attached to a transparent plastic plate.

However, when the electromagnetic wave shield member composed of the transparent conductive plastic film and the transparent plastic plate is used by incorporating it into the above-mentioned display device, since it is composed of a large number of members, reflection of light occurs between the members and transmission of light rays. There is a problem that the rate is lowered and the image becomes dark. Therefore, in order to prevent the reflection of light between members and improve the light transmittance, it is attempted to increase the light transmittance by applying a resin having a lower refractive index than the transparent plastic film on the transparent plastic film substrate. Has been done. However, in this case, since the distance between the electromagnetic wave shield member and the display device becomes uneven, interference fringes (Newton's rings) of light are generated, which makes it difficult to view an image.

In general, since these transparent plastic films and transparent plastic plates are insulators, they are easily charged with static electricity, adsorb dust and dirt in the air, stain them,
It also had the drawback of darkening the image. On the other hand, when a transparent conductive film using a transparent plastic film as a base material is used in the transparent electrode for a touch panel, the same problem as in the case of the electromagnetic wave shield member occurs.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a member for electromagnetic wave shielding using a transparent plastic film as a substrate and a transparent electrode for a touch panel, which has less light reflection and a light transmittance when assembled as a display. It is to supply an anti-Newton ring film which is expensive and which does not cause Newton rings and is less likely to adsorb dust or the like as a substrate for a transparent conductive film.

[0006]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that when a treatment for imparting fine irregularities to a transparent plastic film is performed,
Preventing the contact of the transparent plastic film with other members and suppressing the generation of Newton's rings, and when a conductive layer is laminated on the outermost surface of the transparent plastic film, it prevents static electricity from being charged and dust is absorbed. I found that I could prevent dirt from getting dirty.

That is, the present invention is an anti-Newton ring film characterized in that a transparent conductive film is laminated on a transparent plastic film having a textured surface, and the textured treatment is 0.1 μm. An anti-Newton ring film having 20 peaks / cm or more of the above height, or an anti-Newton ring film having a haze (HAZE value) of 10% or less.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a transparent plastic film having an uneven surface is used. When the surface is not subjected to the concavo-convex treatment, when the transparent plastic film and another member are used in a stacked manner, there are portions that come into contact with portions that do not come into contact. A layer in which the distance between the transparent plastic film and the other member changes continuously is generated between the contacting portion and the non-contacting portion, and Newton rings are generated in this layer.

On the other hand, in the case where the surface is subjected to unevenness treatment, even when the transparent plastic film and other members are used in a superposed manner, the contact points are points,
Overall, the intervals are constant, and Newton's rings do not occur.

The substrate of the transparent plastic film is not particularly limited as long as it has high transparency, and examples thereof include polyethylene terephthalate, polyether sulfone, polyester, poly (meth) acrylate, polycarbonate, polyarylate and polyamide. Etc. The thickness of the film is not particularly limited, but it is 25 to 2 due to the strength and handleability of the film.
50 μm is preferred.

As a method for treating the unevenness of the film, for example, a transparent resin containing fillers (particles), for example, a melamine resin (SF-C-329 manufactured by Dainippon Ink and Chemicals, Inc.) is applied, and the film is formed. In that case, there may be mentioned a method in which the surface is pressure-bonded to a roll having an uneven surface and transferred.

The case where the resin is coated in a concavo-convex pattern by the triple reverse coating method will be described in detail. In the three roll reverse coating method, the resin to be applied is usually scratched by a roll called a coat roll, the roll called a doctor roll and the coat roll are brought into contact, the resin on the coat roll is made uniform, and the interval is adjusted. Adjust the thickness to be applied. After forming a resin layer with a desired thickness evenly on the coat roll, contact the transparent plastic film as the base material with the roll called a backup roll, transfer the resin on the coat roll, and dry or UV. And so on. Here, for example, a resin layer having a satin-finished uneven surface can be applied by subjecting the coat roll to surface unevenness treatment such as a satin finish.

Further, the concavo-convex treatment must be performed so that there are 20 peaks / cm or more of 0.1 μm or more. If the peak height is less than 0.1 μm,
And, if the number of peaks is less than 20 / cm, Newton's rings are generated as in the case where no unevenness is processed, which is not preferable. From the viewpoint of handling property, it is preferable that the peak size does not exceed 500 μm. Also, there is no particular upper limit on the number of peaks, but if the number of peaks increases, the haze (HAZ
Since the E value) increases, it is usually 1000 pieces / cm or less.

The haze of this film (HAZE value)
Must be 10% or less. If the haze exceeds this range, the proportion of light that is scattered and transmitted increases, resulting in a screen with poor resolution, which is not preferable. In addition, since the surface is subjected to the uneven treatment as described above, the haze is generally not less than 0.1%.

Further, a transparent conductive layer must be formed on the surface of the transparent plastic film that has been processed to have irregularities.
If the transparent conductive layer is not formed on the uneven surface of the plastic film, it is likely to be charged with static electricity, to easily absorb dust in the air and to be easily soiled. This phenomenon is particularly remarkable when used for CRT. This is because in the CRT, static electricity is generated by a constant voltage load during switching operation.

The surface resistance of the transparent conductive layer is 10 ⁹ Ω
It is preferably less than or equal to / □. If the surface resistance value exceeds the above range, static electricity tends to accumulate, which is not preferable. The lower limit of the surface resistance value is not particularly limited, but if it is 10 Ω / □ or less, the transparency is deteriorated, which is not preferable.

As the transparent conductive layer, for example, an inorganic thin film layer of indium tin oxide (ITO), tin oxide, silver, copper, etc. formed by a sputtering method, a CVD method, etc., palladium sulfate, tin sulfate, tin chloride. And the like, which are formed by applying an aqueous solution containing a water-soluble metal compound such as

These transparent conductive layers may be provided to serve as an electromagnetic wave shield layer, or a transparent conductive layer may be separately provided on the back surface of the uneven portion to serve as an electromagnetic wave shield layer.

Mechanical strength can be increased by laminating a transparent plate such as an acrylic plate on the surface of the anti-Newton ring film according to the present invention which is not subjected to the uneven treatment. In addition, a film having an antireflection effect may be attached to the transparent plate surface, or an antireflection treatment may be performed.

[0020]

The present invention will be described below with reference to examples. The evaluation items and evaluation method were as follows. Evaluation of surface irregularities (detection of peaks): JIS-B-060
It was carried out based on 1. Specifically, stylus surface roughness meter (ET-30K, Kosaka Laboratory Ltd., stylus diameter: 0.5
of the peaks obtained at that time, and the height of the peaks obtained at that time, and the peaks per 1 cm. The number of Light transmittance, haze: Measured based on JIS-K-7105. Specifically, it was evaluated using NDH-100H manufactured by Nippon Denshoku Co., Ltd. Surface resistance: Four-terminal method was used. Specifically, it was performed using Loresta SP manufactured by Mitsubishi Petrochemical Co., Ltd. Contamination by dust: CRT (manufactured by NEC Corporation, PC-T)
The sample was placed on V455), turned on and off 50 times, and then the sample was removed to visually confirm the presence or absence of contamination. Anti-Newton ring property: Similar to the evaluation of dust contamination property, the sample was placed on the CRT and the occurrence of Newton ring was visually evaluated. Image sharpness: The sample was placed on a CRT in the same manner as the dust stain evaluation, and the screen sharpness was visually evaluated.

Example 1 Polyethylene terephthalate (PE having a thickness of 188 μm)
T) A melamine-based resin (SF-C-329 manufactured by Dainippon Ink and Chemicals, Inc.) in which 20% by weight of silica powder having an average particle diameter of 2 μm is dispersed is applied on the film by a three-reverse method, and at 80 ° C. After drying for 3 minutes, a coating film having a thickness of 5 μm was obtained. Specifically, the coat roll was subjected to a satin finish so that the satin finish pattern was transferred when the PET film was coated with the resin. An ITO thin film layer having a surface resistance of 1000 Ω / □ was formed by a sputtering method after treating the resin in a satin finish to obtain an anti-Newton ring film. Surface roughness of this film,
The light transmittance, haze, surface resistance, dust contamination, anti-Newton ring property, and image clarity were evaluated. The results are summarized in Table 1.

Example 2 An anti-Newton ring film was prepared in the same manner as in Example 1 except that the amount of silica powder dispersed in the melamine resin was 40% by weight. The surface irregularities, light transmittance, haze, surface resistance, dust stain resistance, anti-Newton ring property, and image clarity of this film were evaluated. The results are summarized in Table 1.

Example 3 An anti-Newton ring film was obtained in the same manner as in Example 1 except that the ITO thin film layer was formed to have a surface resistance value of 200 Ω / □. The surface irregularities, light transmittance, haze, surface resistance, dust stain resistance, anti-Newton ring property, and image clarity of this film were evaluated. The results are summarized in Table 1.

Example 4 An anti-Newton ring film was obtained in the same manner as in Example 1 except that the transparent conductive layer was formed by immersing it in a 1 wt% tin chloride aqueous solution. The surface irregularities, light transmittance, haze, surface resistance, dust stain resistance, anti-Newton ring property, and image clarity of this film were evaluated. The results are also shown in Table 1.

Comparative Example 1 A transparent film was obtained in the same manner as in Example 1 except that a roll not subjected to a satin treatment was used as a coat roll when the melamine resin was applied by the triple roll reverse coating method. Surface irregularities of this film, light transmittance, haze, surface resistance, dust contamination, anti-Newton ring property,
The sharpness of the image was evaluated. The results are also shown in Table 1.

Comparative Example 2 A transparent film was obtained in the same manner as in Example 1, except that the proportion of silica powder added to the melamine resin was 80% by weight. The surface irregularities, light transmittance, haze, surface resistance, dust stain resistance, anti-Newton ring property, and image clarity of this film were evaluated. The results are also shown in Table 1.

Comparative Example 3 The transparent film that had been subjected to the satin treatment and was prepared in Example 1 was used as it was. Therefore, this film has IT
The O layer is not formed. The surface irregularities, light transmittance, haze, surface resistance, dust stain resistance, anti-Newton ring property, and image clarity of this film were evaluated. The results are also shown in Table 1.

[0028]

[Table 1] Evaluation criteria: ○: No problem ×: Problem

[0029]

INDUSTRIAL APPLICABILITY The anti-Newton ring film having a transparent plastic film as a base material according to the present invention has little light reflection when assembled as a display in an electromagnetic wave shielding member and a transparent electrode for a touch panel, and has a light transmittance. Is high, and Newton's rings do not occur, and dust is hard to be adsorbed.

Front page continuation (72) Inventor Yuichiro Harada 2-1-1, Tango-dori, Minami-ku, Aichi Prefecture Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Yoshihiro Sakai 2--1, Tango-dori, Minami-ku, Aichi Prefecture Mitsui Totatsu Chemical Co., Ltd. (72) Inventor Akira Suzuki 2-1, Tango Dori, Minami-ku, Aichi Prefecture Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Akemi Nakajima 2-chome, Tango Dori, Minami-ku, Aichi Prefecture Address Mitsui Toatsu Chemical Co., Ltd.

Claims (3)

[Claims] 1. An anti-Newton ring film, wherein a transparent conductive layer is laminated on a transparent plastic film having an uneven surface. 2. The anti-Newton ring film according to claim 1, wherein the anti-Newton ring film is subjected to a concavo-convex treatment so that 20 or more peaks having a height of 0.1 μm or more are present. 3. The anti-Newton ring film according to claim 1, which has a haze (Haze value) of 10% or less.